Buck's sunglasses and mouth resemble Garnet's. He also has a crease on his forehead (corresponding with Garnet's third eye).

The Cool Kids' personalities, match certain aspects of each of the Crystal Gems'.

Jenny is fun, carefree and counter-dependent, like Amethyst.

Buck is stoic, level-headed and independent, with more going on inside his head than he shows on the outside, much like Garnet.

Sour Cream is artistic and cares about rules such as seat belt safety, similar to Pearl who cares about road safety to the point of not playing a racing game correctly. At the same time, he's also a rebel against what he's "supposed" to be (a fisherman).